Fe in jadeite can not be replaced by cr, and jadeite is mainly composed of jadeite or other pyroxene minerals (such as chromic jadeite and omphacite) in clinopyroxene cluster. ) and high jadeite molecule (NaAlSi2O6). The mineral composition of jadeite is considered to be the product of high-pressure and low-temperature metamorphism, which has been confirmed by jadeite synthesis experiments. For example, NaAl in jadeite is largely replaced by calcium, magnesium, iron and chromium. , beyond the scope of jadeite composition, become other pyroxenes (such as chromic jadeite, omphacite, diopside, aegirine, etc. ). Jade composed of diopside and aegirine can also be called "pyroxene jade", but it is not jadeite. The article "Black Jade" published in the 3rd issue of Jewellery Technology in 2000 called black diopside jade jadeite, which was inappropriate.